De Fratus, a right-hander, and Diekman, a left-hander, are with the Phillies for Sunday’s game against the Atlanta Braves.

Diekman is 1-1 with a 4.64 ERA in 23 games with Philadelphia. He was optioned to Lehigh Valley on July 31.

De Fratus was on the Phillies’ 60-day disabled list with a right elbow sprain until he was activated and optioned to Lehigh Valley on July 18. He was 1-0 with a 2.25 ERA in five appearances last season.